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Volume 5 (1997)
- Issue 6 Pages 11-
- Issue 5 Pages 11-
- Issue 4 Pages 16-
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Volume 5, Issue 4
Displaying 1-6 of 6 articles from this issue
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9. Orthogonal Expansion for Tolerance DesignGenichi Taguchi1997 Volume 5 Issue 4 Pages 16-21
Published: August 01, 1997
Released on J-STAGE: December 24, 2016
JOURNAL FREE ACCESSTolerance Design needs to know the magnitude of contribution of each noise variables on the output response. As the most effective way to obtain those magnitude of contribution, the use of an orthogonal array is explained in this article. The methods here have been applied for both cases, the case where we have mathematical model and the other where we have to conduct an experiments as we have no mathematical model.
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Kazuhiro Esaki, Muneo Takahashi1997 Volume 5 Issue 4 Pages 30-37
Published: August 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSIt is said that the quality of softwares is directly resulted from human factors and environmental conditions during the development stage. In order to improve the quality and productivity of software's, it is important to clarify the relationship between human factors and the nature of errors. In this experimental study, the errors were categorized based on its seriousness to impact the software, The results were analyzed using the standard S/N ratio from quality engineering.View full abstractDownload PDF (1857K)
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Kenichi Shimada1997 Volume 5 Issue 4 Pages 38-45
Published: August 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSThe pattern constructing technique in screen printing processes is a commonly used manufacturing method, There are many case studies showing the quality improvement by evaluating the transformability of the process or the electrical characteristics of products. This paper is a study showing the improvement which could not be achieved using traditional quality characteristics : the quality items not related with electrical characteristics such as appearance in terms of fraction defective like pin holes. The study was also made to investigate the relationship between appearance and basically requested characteristics such as resistance, linearity, durability or pattern precision, etc.View full abstractDownload PDF (1972K) -
Akio Aoki1997 Volume 5 Issue 4 Pages 46-51
Published: August 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSOrthogonal array L18 is frequently used in quality engineering. Under normal application,8factors, i.e.,1 two-level factor and 7 three-level factors, are assigned to this array. But it can also be used to assign nine factors, i.e., 1 two-level factor and 8 three-level factors,without being forced to use a larger orthogonal array such as L36. In this paper, analysis method and same hints are explained using a case entitled "Technology Development of Drain Electrode process for Power MOSFET" which was reported earlier in Volume 4, No. 2.View full abstractDownload PDF (1033K)
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Paul Wang1997 Volume 5 Issue 4 Pages 52-60
Published: August 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSThe timely detection and identification of an enemy's radar signal is critical to the success of an electronic countermeasure (ECM) mission. ln 1995, a project was initiated using Taguchi methods to improve the threat detection and identification capability of a generic electronic warfare (EW) swept superheterodyne (superhet) receiver. This receiver must demonstrate robust performance in a wide range of EW conditions. To optimize robustness, the performance characteristic selected for evaluation was the receiver's probability of detecting and identifying a random radar threat versus the elapsed time of the threat in a dynamic EW environment. The Taguchi experiment utilized a L18×L18 orthogonal array matrix, housing six (6) control factors and seven (7) noise factors. A computer simulator developed in 1994 was upgraded to perform the required matrix experiments. Results of this experiment identified optimum levels of control factors achieving minimum elapsed time of detecting and identifying radar threats,Computer simulations, using identified control factor levels, indicated that when operating in a signal environment with threat density varying between 250 thousand to 1.5 million pulses per second, the EW receiver demonstrated a 57% reduction of elapsed time for threat detection in comparison with the current baseline design.View full abstractDownload PDF (1696K) -
H. Rüfer, A. Reutter-Maier, G. Wich1997 Volume 5 Issue 4 Pages 61-65
Published: August 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSBiotechnology makes use of recombinant bacteria for synthesis and production of organic compounds like proteins and enzymes. A bacteria (E.coli) is transformed with a plasmid containing a gene and an expression promoter for production of the desired protein. The batch process starts with an appropriate cell growth followed by induction and activation of the expression promoter. Fermentation pararneters affecting the production performance are investigated. Dynamic analysis reveals adaptation of fermentation conditions for optimum production rate. Thus parameter settings have been predicted that lead to a doubling of the protein production.View full abstractDownload PDF (1121K)
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